exa-

prefix

In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10¹⁸ (a short scale quintillion or long scale trillion); one million million million.

Opposite
atto-
OriginAncient Greek ἕξ →
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Meanings

prefix
  1. In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10¹⁸ (a short scale quintillion or long scale trillion); one million million million.

Synonyms & antonyms

Opposite
atto-

Origin

  1. Ancient Greekἕξ“six”
  2. Englishexa-

From Ancient Greek ἕξ (héx, “six”), for the sixth order of 10³, analogous to tera-.

More words from Ancient Greek

Full word history & related roots →

Translations

Bulgarian екса-
  • екса- (eksa-)SI prefix
Chinese Cantonese 艾-
  • 艾- (ngaai⁶)SI prefix
Chinese Mandarin 艾-, 艾可薩- /艾可萨-
  • 艾- (ài-)SI prefix
  • 艾可薩- /艾可萨- (àikěsà-)SI prefix
Czech exa-
  • exa-SI prefix
Dutch exa-
  • exa-SI prefix
Esperanto eksa-
  • eksa-SI prefix
Finnish eksa-
  • eksa-SI prefix
French exa-
  • exa-SI prefix
German exa-
  • exa-SI prefix
Greek εξα-
  • εξα- (exa-)SI prefix
Hungarian exa-
  • exa-SI prefix
Indonesian eksa-
  • eksa-SI prefix
Japanese エクサ
  • エクサ (ekusa)SI prefix
Korean 엑사-
  • 엑사- (eksa-)SI prefix
Malay eksa-
  • eksa-SI prefix
Polish eksa-
  • eksa-SI prefix
Portuguese exa-
  • exa-SI prefix
Russian экза-, экса-
  • экза- (ekza-)SI prefix
  • экса- (eksa-)SI prefix
Spanish exa-
  • exa-SI prefix
Thai เอกซะ-
  • เอกซะ- (èek-sà)SI prefix
Vietnamese ê-xa
  • ê-xaSI prefix
Cite this entry
APA

exa-. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/exa-

MLA

“exa-.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/exa-. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “exa-,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/exa-.

Source: exa- on Wiktionary, CC BY-SA 4.0.